Motion transforming device



Oct. 17, 1944. H. L. CONRAD 2,360,762

MOTION TRANSFORMING DEVICE Filed July 5, 1945 fikWQLfi L, 60/1/040 IINVENTOR.

Patented Oct. 17, 1944 UNITED STATES PATENT OFFlCE 2,360,762 MOTIONTRANS FORMING DEVICE Harold L. Conrad, Oklahoma City, Okla...Application July 5, 1943, Serial No. 493,547

3 Claims.

This invention relates to transmission mechanisms and it has particularreference to a new and novel device by which a rotative force istransformed into a reciprocative action.

" The principal object of the inventioniisto provide a compact assemblyof parts including a driven shaft carrying a disc to which is pivoted asmall gear, the'latter being constrained to travel in a circular fashionby reason of, its epicyclic relationship with an internal gear ,and tothe small gear is pivoted a second disc which in turn has a shafteccentrically connected to its face, the combination being designed andarranged to constrain said shaft to travel in an undeviatingly straightline. I

Another object of the invention is to provide a transmission mechanismparticularly useful in performing certain important functions such asoperating the scribing means on recording charts and other adaptationswithin its range of operation. 7

With the foregoing objects as paramount, the

v invention has particular reference to certain features ofaccomplishmenhto become manifest as the description proceeds, taken inconnection with the accompanying drawing, wherein:

a Figure 1 is a front elevational view of a transmission mechanismconstructed according to the present invention showing its adaptation toa recording mechanism.

; Figure 2 is a plan view in transverse section.

Figure 3 is a perspective view of the invention per se with portionsbrokenaway, and

Figure 4 is a partially developed pattern showing the progressivecircular travel of the disc which actuates the reciprocable arm.

Continuing with a more detailed description of the drawing, reference isprimarily made to Figure 3 wherein l0 denotes a circular case having anintegral, ex'teriorly threaded sleeve ll extending from its rear face.The front face of the case is annularly recessed to define a circularcavity a and an annular ledge 11.

Lying in snug conformity within the circular cavity a is a disc l2,provided with a stem or shaft l'! which extends concentrically throughthe sleeve ll of the case It and is embraced by a bearing It, the outerrace of which is fitted snugly into the sleeve l I. Sufficient clearanceis aflorded between the surfaces of the disc I! and the walls of thecavity a to insure against frictional resistance and much of thefriction which remains is overcome by proper lubrication.

Mounted within the cavity a and secured tothe annular ledge b bycountersunk screws c is an internally toothed ring ii. A portion of thering 15 overlies the disc I! and, in fact, secures the latter againstforward thrust.

A small gear or pinion I6 is mounted on the face of the disc I2 andWhose rotating axis d is in off-centered relationship with the axis ofthe disc I! so that it will be constrained to travel in a circularfashion about the axis of the disc J2 when the latter is rotated andsince its teeth are enmeshed with those of the ring l5 it will revolveas it so travels.

A second and smaller disc l'! is fixedly mounted on the axis d of thegear l6 and has eccentrically pivoted thereto at e, an arm l8. This armis passed through and operates in an aperture in a bracket l9, affixedto a stationary part of the assembly, such as the case ID, as shown.

In Figure 4 is shown a partially developed pattern of the variouspositions assumed by the disc H in its travel about the rotating axis ofthe disc II. It is apparent from this illustration that as the shaft I3is operated by a motor, belt-- will follow the circular path thereof andlike-' wise rotate. The ratio of travel between the disc I! and the discI! together with the relative dimensions of these parts insures that thepivot point e of. the arm I8 will not change its position relative to adiametrical line through the pattern such as indicated at AA in Figure4. Accordingly, as the disc ll moves in an epicyclic path about thecenter of disc l2, the arm It will be reciprocated to perform anyfunction desired within its range of operation.

In Figures 1 and 2 is shown one adaptation of the invention, that ofactuating the stylus arm of a recording apparatus, the latter consistingof the housing 20 within which operates a chart 2|. As shown, theinvention is supported by a mounting plate 22 so that the arm It willextend over the face of the chart 2|. A stylus 23 is mounted on thestylus arm 24, the latter, in turn, being mounted on the arm l8 of theinvention.

It, is apparent from the foregoing that as the device of the inventionis operated, the arm I! is reciprocated tocause the stylus 23 to travelin relation to time, for example, in calculating footage drilled and thetime required for such drilling in oil field work.

It is understood, however, that the foregoing suggests only oneadaptation of the invention and that the latter is not limited thereto.Moreover, certain changes and modifications in the construction shownmay be made from time to time as may be found desirable or necessarywithout departing from the spirit or intent of the invention as setforth in the following claims.

What is claimed is:

1. A device for transforming rotary to recipro-' eating motioncomprising an annularly recessed case having a hollow, exteriorlythreaded extension, a retaining nut on said extension, a shoulder formedabout the edge of said recess, a disc lying within said recess andhaving a stem disposed concentrically in the hollow extension of saidcase, a toothed ring affixed to the shoulder of said recess whose teethoverreach the edge of said disc, a gear pivoted to said disc in offsetrelation to its axis and engaging the teeth of said ring, a second discafllxed to the axis of said gear and a pitman eccentrically pivoted tosaid second disc and reciprocated longitudinally upon rotation of thestem of said first disc.

2. In a device for imparting reciprocative motionv to a work performingmember from a rotating shaft, the combination comprising a case inoffset relation to its axis and a pitman having one end eccentricallyconnected to said gear and guided intermediate its ends and constrainedto move longitudinally upon rotation of said shaft.

3. In a device for transforming rotative to reciprocative motion, thecombination comprising a case having a hollow extension for itsretention on a support andfurther provided with an annular recess in itsopposite face, a disc rotatably confined in said recess and providedwith an operating shaft disposed concentrically in said extension, agear ring affixed to said case having its toothed inner edge overlyingthe edge of said disc as a retaining means, a gear eccentrically pivotedto the face of said disc and engaging the teeth of said ring and apitman constrained intermediate its ends against other than longitudinalmovement and having one end eccentrically pivoted to said gear wherebyrotation of said shaft will effect reciprocation of said pitman.

HAROLD L. CONRAD.

